<p>
    点击事件：<click-me></click-me>
</p>

<p>
    请输入：<key-up1></key-up1>
</p>
<p>
    请输入：<key-up2></key-up2>
</p>
<p>
    回车显示：<key-up3></key-up3>
</p>
<p>
    回车/失去焦点显示：<key-up4></key-up4>
</p>

<p>
    请输入：<loop-back></loop-back>
</p>

